cpu: aarch64: improve memory management safety for jit_uni_softmax

[Permanence-AI-Coder]

Description

The code changes in this PR were generated automatically by the Permanence AI Coder and reviewed by @fwph & @jweese. This PR updates memory allocation for softmax_driver_ objects in two structs. Note that in the macro DNNL_DISALLOW_COPY_AND_ASSIGN was missing; it has been added to be consistent with other objects.

on-behalf-of: @permanence-ai github-ai@permanence.ai

Checklist

General

• Do all unit and benchdnn tests (make test and make test_benchdnn_*) pass locally for each commit?
• Have you formatted the code using clang-format?

[spalicki]

@Sqvid You have approved this change and then re requested a review on yourself, do you want more time for this review?

[theComputeKid]

@spalicki Could you clarify why we are modifying to utils::make_unique instead of using the std lib? Seems like a pattern, but still, wanted to clarify.

[dzarukin]

@spalicki Could you clarify why we are modifying to utils::make_unique instead of using the std lib? Seems like a pattern, but still, wanted to clarify.

std lib version is available only from C++14, while by default oneDNN gets compiled with C++11. That's the primary reason.

[spalicki]

std::make_unique is not part of C++11, only C++14.